/**
 * Licensed to Neo Technology under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Neo Technology licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.neo4j.neoclipse.property.action;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Shell;
import org.neo4j.graphdb.PropertyContainer;
import org.neo4j.neoclipse.action.Actions;
import org.neo4j.neoclipse.graphdb.GraphDbUtil;
import org.neo4j.neoclipse.property.NeoPropertySheetPage;

/**
 * Action to add a new property to a PropertyContainer.
 * @author Anders Nawroth
 */
public class PasteAction extends PropertyAction
{
    private final Shell shell;
    private static final TextTransfer TRANSFER_TYPE = TextTransfer
        .getInstance();

    public PasteAction( final Composite parent,
        final NeoPropertySheetPage propertySheet )
    {
        super( Actions.PASTE, parent, propertySheet );
        shell = propertySheet.getControl().getShell();
    }

    @Override
    public void run()
    {
        PropertyContainer propertyContainer = getPropertyContainer();
        if ( propertyContainer == null )
        {
            return;
        }
        performOperation( propertyContainer );
    }

    /**
     * @param entry
     * @param parFirstElement
     */
    protected void performOperation( final PropertyContainer container )
    {
        // TODO handle the case where a key already exists?
        Clipboard clipboard = new Clipboard( shell.getDisplay() );
        Object data = clipboard.getContents( TRANSFER_TYPE );
        clipboard.dispose();
        if ( !(data instanceof String) )
        {
            MessageDialog.openError( shell, "Error",
                "Could not paste content from the clipboard." );
            return;
        }
        // parse the string
        ClipboardUtil cu = new ClipboardUtil( (String) data );
        final Object value = cu.getValue();
        if ( value == null )
        {
            MessageDialog
                .openError( shell, "Error",
                    "The clipboard content doesn't seem to be a neo4j property value." );
            return;
        }
        final String key = cu.getKey();
        GraphDbUtil.setProperty( container, key, value, propertySheet );
    }
}
